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OpenAI's new GPT-4.5 model is a better, more natural conversationalist

In what has already been a busy past few days for new model releases, OpenAI is capping off the week with a research preview of GPT-4.5. The company is touting the new system as its largest and best model for chat yet. In early testing, OpenAI says people found GPT-4.5 to be a more natural conversationalist, with the ability to convey warmth and display a kind of emotional intelligence.<br /> In one example shared by OpenAI, a person tells ChatGPT they&#39;re going through a hard time after failing a test. Where the company&#39;s previous models, including GPT-4o and o3-mini, might commiserate with the individual before offering a long list of unsolicited advice, GPT-4.5 takes a different tact. "Want to talk about what happened, or do you just need a distraction? I&#39;m here either way," the chatbot says when powered by GPT-4.5.<br /> <br /> The gains shown by GPT-4.5 are the result of advancements OpenAI made in unsupervised learning. With unsupervised learning, a machine learning algorithm is given an unlabeled data set and left to its own devices to find patterns and insights. GPT-4.5 doesn&#39;t "think" like the company&#39;s state-of-the-art reasoning models, but in training the new model OpenAI made architectural enhancements and gave it access to more data and compute power. "The result is a model that has broader knowledge and a deeper understanding of the world, leading to reduced hallucinations," the company says.<br /> Speaking of reduced hallucinations, OpenAI measured how much better GPT-4.5 in that regard. When put through SimpleQA, an OpenAI-designed benchmark that tests large language models on their ability to answer "straightforward but challenging knowledge questions," GPT-4.5 beat out o3-mini, GPT-4o and even o1 with a hallucination rate of 37.1 percent. Obviously, the new model doesn&#39;t solve the problem of AI hallucinations altogether, but it is a step in the right direction.<br /> Despite its relative strengths over GPT-4o and o3-mini, GPT-4.5 isn&#39;t a direct replacement for those models. Compared to OpenAI&#39;s reasoning systems, GPT-4.5 is "a more general-purpose, innately smarter model." Additionally, it&#39;s not natively multimodal like GPT-4o, meaning it doesn&#39;t work with features like Voice Mode, video or screensharing. It’s also "a very large and compute-intensive model."<br /> It&#39;s best to think of GPT-4.5 as a stepping stone to systems OpenAI plans to offer in the future. In fact, Sam Altman said as much earlier this month when he shared the company&#39;s roadmap, noting GPT-4.5 would be "our last non-chain-of-thought model" — referring to the fact that the new system doesn&#39;t solve problems by tackling them step by step like OpenAI&#39;s reasoning models do. Its successor, GPT-5, will likely integrate many of OpenAI&#39;s latest technologies, including its frontier o3 model. OpenAI reiterated that today, saying it plans to bring GPT-4.5&#39;s "unique strengths, including broader knowledge, stronger intuition, and greater &#39;EQ,&#39; to all users in future models."<br /> In the meantime, ChatGPT Pro subscribers can begin using GPT-4.5 starting today, with Pro and Team users slated to gain access starting next week.This article originally appeared on Engadget at https://www.engadget.com/ai/openais-new-gpt-45-model-is-a-better-more-natural-conversationalist-200035185.html?src=rss

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